package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /*
    * 添加购物车
    * */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车的商品是否已经存在了

        ShoppingCart shoppingCart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需将数量+1
        if (list != null && !list.isEmpty()){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，就需要插入一条购物车数据

            //判断本次添加的购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId !=null) {
                //本次添加的购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //本次添加的购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }
/*
* 查看购物车
* */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder().userId(userId).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return  list;
    }
    /*
    * 清空购物车
    * */
    @Override
    public void cleanShoppingCart() {
        //获取当前用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteShoppingCartById(userId);
    }
    /*
    * 删除购物车一个商品*/
    @Override
    public void cleanOnly(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart =new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && !list.isEmpty()){
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            //如果商品数量为1，则直接删除商品
            if (number == 1){
                shoppingCartMapper.deleteById(cart.getId());
            }else {
                cart.setNumber(cart.getNumber()-1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }

    }
}
